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22.2 – The Earth-Moon-Sun System – Part II

22.2 – The Earth-Moon-Sun System – Part II. Do Now. What causes lunar phases?. Do Now. What causes lunar phases? Result of the motion of the moon and the sunlight that is reflected from its surface. Key Word. Perigee Apogee Illuminated. Vocab Words. Solar Eclipse Lunar Eclipse.

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22.2 – The Earth-Moon-Sun System – Part II

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  1. 22.2 – The Earth-Moon-Sun System – Part II

  2. Do Now • What causes lunar phases?

  3. Do Now • What causes lunar phases? • Result of the motion of the moon and the sunlight that is reflected from its surface.

  4. Key Word • Perigee • Apogee • Illuminated

  5. Vocab Words • Solar Eclipse • Lunar Eclipse

  6. Motions of the Earth-Moon System • Earth has one natural satellite – the moon • Moon orbits Earth within a period of about a month. • Perigee – The moon is the closest to Earth • Apogee – The moon is the farthest from Earth • The motions of the Earth-moon system constantly change the relative positions of the sun, Earth, and moon. • This results in changes in the appearance of the moon, called the phases of the moon.

  7. http://youtu.be/7vUObZwLJ8A http://www.youtube.com/watch?v=nXseTWTZlks 02/27/12

  8. Lunar Motions • Since the moon rotates and revolves every 27 1/3 days, we only ever see one side of the moon. • Only satellites and Apollo missions have ever seen the back side of the moon.

  9. Eclipses are simply shadow effects. • Solar Eclipse • Lunar Eclipse • http://www.youtube.com/watch?v=xwGs8_otT64 Eclipses

  10. Solar Eclipse • http://www.youtube.com/watch?v=XMyqPxFh5Zw&list=PL59BD9065DEAD4B6E • When the moon moves in a line directly between Earth and the sun, it casts a dark shadow on Earth. • Moon must be at a new moon phase and the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place. • http://eclipse.gsfc.nasa.gov/SEdecade/SEdecade2011.html • Next total for North America is August 21, 2017

  11. Lunar Eclipse • http://youtu.be/2dk--lPAi04 • http://www.youtube.com/watch?v=0FdeLGpAQwQ • When the moon moves within Earth’s shadow. • Moon must be at a full moon phase and the moon’s orbit must cross the plane of the ecliptic for an eclipse to take place. • More common than solar eclipses. • http://eclipse.gsfc.nasa.gov/eclipse.html • Next total for North America is November 13, 2012

  12. Group Activity • On page 626, copy and label Figure 15A.

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